Method of and means for jointing electric-current conductors



1. F. SCHLEPER.

METHOD OF AND MEANS FOR JOINTING ELECTRIC CURRENT CONDUCTORS.

APPLICATION FILED APR.20, 1922.

1 ,41 9, 523 Patented J une 13, 1922.

K a ,w,

MrrngyJ UNITED STATES PATENT OFFICE.

METHOD OF AND MEANS FOR J'OIN'IING ELECTRIC-CURRENT GONDUCTOBS.

Speei flcation of Letters Patent. P t t d June 13-, 1922.

Application filed April 20, 1922. Serial no? 555,697.

T 0 all whom it may concern:

Be it known that I, J OHANNES FRANoIsoUs SoHLnPnn, a subject of the Queen of the Netherlands, residing at Amsterdam, Netherlands, have invented certain new and useful Improvements in and Relating to Methods of and Means for J ointing Electric-Current Conductors, of which the following is a specification.

My present method of jointing electric current conductors is characterized by this, that the naked ends of thewires-are contorted and then twisted into a metallic case or sleeve provided internally with conical or equivalent screw thread, and that said case is insulated by a cap of suitable material. As to the insulating cap,this may, for instance, have a screw connection withthe case so that when the contorted wire ends are twisted into the case the latter cannot turn with respect to the cap.

The annexed drawing illustrates the said invention, Figure 1 being a longitudinal sectional view of a suitable form of my novel means, Figure 2 being an elevational view thereof at a reduced scale.

The illustrated means comprise an externally conical open ended brass case-1 with internal conical screw thread. Said case fits into an insulating cap 2 and is provided near its open end with ordinary external screw thread for receiving internal screw thread of the cap 2.

The naked wire ends are contorted to form a joint 3 which is then twisted into case 1 covered by cap 2., \Vithin certain limits it is immaterial how great the diameter of the joint 3 is, for owing to the taper of the screw thread in the case 1 this thread always engages the joint 3 at a greater or a smaller distance from the open end of case 1. It is therefore clear that when the contorted wire ends are twisted with suflicient force into the case 1 a reliable contact is established and that the screw thread in case 1 cuts a corresponding'thread in the wire ends. If desired I may then solder the joint.

During the insertion-and tightening of more wires ofvdifl'eren't gauges.

As a matter of course it is not necessary for the internal screw thread to be exactly conical, but it. is essential that said thread is tapered. That is to say, the inner wall of case 1 may be formed by a coaxial series of cylindrical walls of gradually decreasin diameter, each provided with screw threa The screw connection between the case 1- and the cap 2 could be replaced by any other connection adapted during the insertion and tightening of the contorted wire ends, to prevent rotary motion of the case in respect to the cap. 7

By splitting the case 1 as indicated in dotted lines in Fig. 1 I may ensure increased clamping action of the case 1 on the wire ends.

Claims:

1. A process for joining electric current conductors which comprises contorting the bare wire ends and then twisting such wire ends into a metallic case having internal screw threads of decreasing diameter so that the threads of the case cut into and secure the wire ends.

2. A means for joining electric current conductors, comprislng a metallic case having a conical internal screw thread into which the bared ends of the conductors are held by twisting, and an insulating cap fitting on said case. v

3. A means as claimed in claim 2, in which means is provided between the cap and case for preventing the latter from turning when the ends are twisted into the case.

In testimony whereof I aflix my signature.

JOHANNBS FRANCISCUS SCHLEPER. 

